2001 INFINITI QX4 engine

SAT496G
IBefore road test, familiarize yourself with all test procedures
and items to check.
IConduct tests on all items until specified symptom is found.
Troubleshoot items which check out No Good after road test.
Refer to ªON BOARD DIAGNOSTIC SYSTEM DESCRIP-
TIONº and ªTROUBLE DIAGNOSES FOR SYMPTOMSº,
AT-33 - AT-50 and AT-215 - AT-257.
1. CHECK BEFORE ENGINE IS STARTEDNBAT0024S02
1 CHECK O/D OFF INDICATOR LAMP
1. Park vehicle on flat surface.
2. Move selector lever to ªPº position.
3. Turn ignition switch to ªOFFº position.
Wait at least 5 seconds.
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4. Turn ignition switch to ªONº position. (Do not start engine.)
5. Does O/D OFF indicator lamp come on for about 2 seconds?
SAT133K
YesorNo
Ye s©GO TO 2.
No©Go to ª1. O/D OFF Indicator Lamp Does Not Come Onº, AT-218.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-64

2. CHECK AT IDLE=NBAT0024S03
1 CHECK ENGINE START
1. Park vehicle on flat surface.
2. Turn ignition switch to ªOFFº position.
3. Move selector lever to ªPº or ªNº position.
4. Turn ignition switch to start position.
5. Is engine started?
YesorNo
Ye s©GO TO 2.
No©Go to ª2. Engine Cannot Be Started In ªPº and ªNº Positionº, AT-221.
2 CHECK ENGINE START
1. Turn ignition switch to ªOFFº position.
2. Move selector lever to ªDº, ª1º, ª2º or ªRº position.
3. Turn ignition switch to start position.
4. Is engine started?
YesorNo
Ye s©Go to ª2. Engine Cannot Be Started In ªPº and ªNº Positionº, AT-221.
No©GO TO 3.
3 CHECK VEHICLE MOVE
1. Turn ignition switch to ªOFFº position.
2. Move selector lever to ªPº position.
3. Release parking brake.
4. Push vehicle forward or backward.
5. Does vehicle move when it is pushed forward or backward?
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YesorNo
Ye s©Go to ª3. In ªPº Position, Vehicle Moves Forward Or Backward When Pushedº, AT-222.
No©GO TO 4.
4 CHECK VEHICLE MOVE
1. Apply parking brake.
2. Move selector lever to ªNº position.
3. Turn ignition switch to ªSTARTº position and start engine.
4. Release parking brake.
5. Does vehicle move forward or backward?
YesorNo
Ye s©Go to ª4. In ªNº Position, Vehicle Movesº, AT-223.
No©GO TO 5.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-66

Cruise Test Ð Part 1=NBAT0024S0404
1 CHECK STARTING GEAR (D1) POSITION
1. Drive vehicle for approx. 10 minutes to warm engine oil and ATF up to operating temperature.
ATF operating temperature:
50 - 80ÉC (122 - 176ÉF)
2. Park vehicle on flat surface.
3. Set overdrive control switch to ªONº position.
4. Move selector lever to ªPº position.
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5. Start engine.
6. Move selector lever to ªDº position.
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7. Accelerate vehicle by constantly depressing accelerator pedal halfway.
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8. Does vehicle start from D1?
Read gear position.
YesorNo
Ye s©GO TO 2.
No©Go to ª8. Vehicle Cannot Be Started From D
1º, AT-233.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-71

7 CHECK LOCK-UP OFF (D4L/U TO D4)
1. Release accelerator pedal.
2. Is lock-up released when accelerator pedal is released?
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YesorNo
Ye s©GO TO 8.
No©Go to ª14. Lock-up Is Not Releasedº, AT-249.
8 CHECK SHIFT DOWN (D4TO D3)
1. Decelerate vehicle by applying foot brake lightly.
2. Does engine speed return to idle smoothly when A/T is shifted from D
4to D3?
Read gear position and engine speed.
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YesorNo
Ye s©1. Stop vehicle.
2. Go to ªCruise test Ð Part 2º, AT-75.
No©Go to ª15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3)º, AT-250.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-74

3 CHECK SHIFT UP (D2TO D3)
Does A/T shift from D2to D3at the specified speed?
Read gear position, throttle position and vehicle speed.
Specified speed when shifting from D
2to D3:
Refer to Shift schedule, AT-356.
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YesorNo
Ye s©GO TO 4.
No©Go to ª10. A/T Does Not Shift: D
2,D3º, AT-239.
4 CHECK SHIFT UP (D3TO D4) AND ENGINE BRAKE
Release accelerator pedal after shifting from D2to D3.
Does A/T shift from D
3to D4and does vehicle decelerate by engine brake?
Read gear position, throttle position and vehicle speed.
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YesorNo
Ye s©1. Stop vehicle.
2. Go to ªCruise test Ð Part 3º, AT-77.
No©Go to ª11. A/T Does Not Shift: D
3,D4º, AT-242.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-76

3 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
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YesorNo
Ye s©GO TO 4.
No©Go to ª15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3)º, AT-250.
4 CHECK SHIFT DOWN (D3TO D2)
1. Move selector lever from ªDº to ª2º position while driving in D3(O/D OFF).
2. Does A/T shift from D
3(O/D OFF) to 22?
Read gear position.
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YesorNo
Ye s©GO TO 5.
No©Go to ª18. A/T Does Not Shift: D
3,D2, When Selector Lever ªDº,ª2º Positionº,
AT-254.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-78

5 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
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YesorNo
Ye s©GO TO 6.
No©Go to ª15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3)º, AT-250.
6 CHECK SHIFT DOWN (22TO 11)
1. Move selector lever from ª2º to ª1º position while driving in 22.
2. Does A/T shift from 2
2to 11position?
SAT778B
YesorNo
Ye s©GO TO 7.
No©Go to ª19. A/T Does Not Shift: 2
2,11, When Selector lever ª2º,ª1º Positionº, AT-255.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-79

7 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
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YesorNo
Ye s©1. Stop vehicle.
2. Perform self-diagnosis. Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
No©Go to ª20. Vehicle Does Not Decelerate By Engine Brakeº, AT-256.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-80